Android7.0 mobile phone Program (with source code download), android7.0 source code download

Android7.0 mobile phone Program (with source code download), android7.0 source code download

Project address, star
Https://github.com/979451341/AppAlive

I did not intend to discover the black technology when I was learning audio and video. I found that when I used AudioTrack to play music, I used a one-key cell phone cleanup and found that the app was still there. I meant that Activity was still alive.

I remembered that the same was true of codoy music. When I didn't play the music, the codoy music would die if I cleared it with one click, in addition, it still has a front-end notification to survive, but it will still die if you pause the music and then clear it with one click.

Let me talk about my program.

I place a pcm file in the raw file and play the pcm file.

DataInputStream dis = new DataInputStream (new BufferedInputStream (getResources (). openRawResource (R. raw. a); // instance AudioTrack = new AudioTrack (AudioManager. STREAM_MUSIC, mFrequence, mPlayChannelConfig, mAudioEncoding, bufferSize, AudioTrack. MODE_STREAM); track. setStereoVolume (0, 0); // start playing the track. play ();

Among them, I also use track. setStereoVolume (); To set the volume to 0 when playing the pcm file, that is, mute


In addition, the pcm is continuously played and in the background, so I used AsyncTask to control the process and use mIsPlaying to control the playback stop.

Class PlayTask extends AsyncTask <Void, Void, Void >{@ Override protected Void doInBackground (Void... arg0) {mIsPlaying = true; for (; mIsPlaying;) {int bufferSize = AudioTrack. getMinBufferSize (mFrequence, mPlayChannelConfig, mAudioEncoding); short [] buffer = new short [bufferSize]; try {// define the input stream and write the audio into the AudioTrack class, implement playing DataInputStream dis = new DataInputStream (new BufferedInputStream (getResources (). openRawResource (R. raw. a); // instance AudioTrack = new AudioTrack (AudioManager. STREAM_MUSIC, mFrequence, mPlayChannelConfig, mAudioEncoding, bufferSize, AudioTrack. MODE_STREAM); track. setStereoVolume (0, 0); // start playing the track. play (); // because AudioTrack plays a stream, we need to read while playing (mIsPlaying & dis. available ()> 0) {int I = 0; while (dis. available ()> 0 & I <buffer. length) {buffer [I] = dis. readShort (); I ++;} // write the data to AudioTrack. write (buffer, 0, buffer. length);} // end of the track. stop (); dis. close ();} catch (Exception e) {// TODO: handle exception Log. e ("slack", "error:" + e. getMessage () ;}} return null;} protected void onPostExecute (Void result) {} protected void onPreExecute (){}}

For resources occupied by AudioTrack, the app can survive with one-click cleanup on android7.0's mobile phone. This principle is not understandable.


In addition, I used Huawei of android7.0 during the experiment, and the program could not be killed by one-click cleaning. However, the one-click cleanup of meizu of android7.2 is still dead, and the custom memory management is powerful.